Position detent for sun visor for vehicles

A vehicle sun visor having a sun-visor body with a sun-visor shaft at a corner. One end region of the shaft is seated in a bearing housing in the sun-visor body and clamped against by a spring. The end region of the sun-visor shaft has as a detent an axial region corresponding to the axial extent of the spring. The sun-visor shaft has three circumferential regions of different diameter over the axial detent region including a flat, and starting from one lengthwise edge of the flat, a circular arc region and, adjoining that, a region which is spirally decreasing in diameter toward the opposite circumferential edge of the flat.